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With the CHI200(B) Picoamp
Booster and Faraday Cage, current down to a few picoamperes can be readily
measured. The CHI200 is compatible with the Model 600/A, 700/A series of
instruments, while the CHI200B is compatible with Model 600B/C/D, 700B/C/D
and 800B/C series. When used with 700/A/B/C/D series bipotentiostat, the
Picoamp Booster will affect the primary channel only. The internal
sensitivity of the 600C series is the same as the Picoamp Booster (1*10-12
A/V). However, the bias current of the 600B/C/D series input can be as high
as 50 pA. The Picoamp Booster has lower bias current, and it also brings
the preamplifier close to the electrode hence resulting in lower noise. The
Faraday Cage also makes it possible to make relatively fast measurements of
small currents.
When the Picoamp Booster is connected and the sensitivity scale is at or
below 1*10-8 A/V, the Picoamp Booster will be enabled. Otherwise, it will be
disabled. The instruments automatically sense whether a Picoamp Booster is
connected. The enable/disable switching is also automatic. The Picoamp
Booster will be disabled for techniques using automatic sensitivity
switching, such as Tafel plots, bulk electrolysis (BE), and ac impedance
(IMP). It is not necessary to disconnect the Picoamp Booster to run those
techniques.
However, for galvanostatic techniques, such as chronopotentiometry (CP) and
potentiometric stripping analysis (PSA), the Picoamp Booster must be
disconnected. Besides weak signal measurements, the Faraday cage is useful
for eliminating electrical interference, especially line frequency noise. If
the electrochemical cell is picking up electrical noise from the
environment, the additional use of Faraday cage is strongly recommended.
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Dimension: 9.6”(W)
´
8.8”(D) ´
11.8”(H) Weight: 13 Lb.
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Cyclic
voltammogram at an ultramicroelectrode |
Differential pulse voltammogram at an ultramicroelectrode. |
With the CHI680B Amp Booster, the current can be measured up to 2 A. The
CHI680 is compatible with Model 600, 600A, 600B, 600C and 600D series of
instruments. You can stack the CHI600/A/B/C/D and the CHI680B together. The
CHI680B can also be connected to the model 700B/C/D series, but it will only
work for the primary channel.
With the Amp Booster connected, the cell control signals such as purge,
knock and stir are disabled.
The Amp Booster will also allow low current measurements. You may need to
use the Faraday Cage to eliminate line frequency noise when the scan rate is
above 50 mV/s.
The frequency response of the Amp Booster is somewhat lower than that of the
CHI600/A/B/C/D instruments. For high speed experiments, the Amp Booster
should be disconnected.
Dimension: 12.5”(W) ´ 11”(D)
´ 4.75”(H)
Weight: 18 Lb.
CHI684 is a multi-channel multiplexer for the model 400/A, 600A/B/C/D,
700A/B/C/D, 800B/C, 900B and 1100A series. The multiplexer switches four
lines (working, sensing, reference, and counter for a single potentiostat,
second working, reference and counter for a bipotentiostat). You can have
maximum 64 cells, but only one cell can be connected at a time.
The multiplexer is controlled from the "Multiplexer" command under the
Control menu. You can select any channel and run experiments in a sequence
of the selected channels. The files will automatically be saved after each
run. You can also set a prompt before each channel run.
It is allowed to set arbitrary channels immediately. An experiment can then
be run for that particular channel.
Two Macro commands are available for the multiplexer. One is "mch:##". It
allows the user to choose an individual channel. The other macro command is
"mchn". This is used in a For...Next loop to select the channel according to
the For...Next loop counter.
The minimum number of channels for the CHI684 are 8. The channel increment
is 8. The maximum number of channels are 64.
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